Contao\CoreBundle\Framework\ContaoFramework::triggerInitializeSystemHook PHP Method

    private function triggerInitializeSystemHook()
    {
        if (isset($GLOBALS['TL_HOOKS']['initializeSystem']) && is_array($GLOBALS['TL_HOOKS']['initializeSystem'])) {
            foreach ($GLOBALS['TL_HOOKS']['initializeSystem'] as $callback) {
                System::importStatic($callback[0])->{$callback[1]}();
            }
        }
        if (file_exists($this->rootDir . '/../system/config/initconfig.php')) {
            @trigger_error('Using the initconfig.php file has been deprecated and will no longer work in Contao 5.0.', E_USER_DEPRECATED);
            include $this->rootDir . '/../system/config/initconfig.php';
        }
    }